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|
# frozen_string_literal: true
if RUBY_VERSION < "2.1"
warn "Cannot count allocations on #{RUBY_VERSION}."
exit 1
end
begin
require "allocation_tracer"
rescue LoadError
warn "Allocation tracking requires the gem 'allocation_tracer'."
exit 1
end
module Benchmarks
# Calculate the number of allocations during loading.
class LoadAllocations
def self.report(columnar: false, full: false, top_x: nil, mime_types_only: false)
new(
columnar: columnar,
top_x: top_x,
mime_types_only: mime_types_only,
full: full
).report
end
def initialize(columnar: false, full: false, top_x: nil, mime_types_only: false)
@columnar = !!columnar
@full = !!full
@mime_types_only = !!mime_types_only
@top_x = top_x
return unless @top_x
@top_x = top_x.to_i
@top_x = 10 if @top_x <= 0
end
def report
collect
report_top_x if @top_x
puts "TOTAL Allocations: #{@count}"
end
private
def report_top_x
table = @allocations.sort_by { |_, v| v.first }.reverse.first(@top_x)
table.map! { |(location, allocs)|
next if @mime_types_only && location.first !~ (%r{mime-types/lib})
[location.join(":").gsub(%r{^#{Dir.pwd}/}, ""), *allocs]
}.compact!
head = (ObjectSpace::AllocationTracer.header - [:line]).map { |h|
h.to_s.split(/_/).map(&:capitalize).join(" ")
}
table.unshift head
max_widths = [].tap { |mw|
table.map { |row| row.lazy.map(&:to_s).map(&:length).to_a }.tap do |w|
w.first.each_index do |i|
mw << w.lazy.map { |r| r[i] }.max
end
end
}
pattern = ["%%-%ds"]
pattern << (["%% %ds"] * (max_widths.length - 1))
pattern = pattern.join("\t") % max_widths
table.each do |row|
puts pattern % row
end
puts
end
def collect
@allocations =
if @columnar
ObjectSpace::AllocationTracer.trace do
require "mime/types"
MIME::Types.first.to_h if @full
end
else
ObjectSpace::AllocationTracer.trace do
require "mime/types/full"
end
end
@count = ObjectSpace::AllocationTracer.allocated_count_table.values
.inject(:+)
end
end
end
|
